Method for manufacturing a flat-plate battery

ABSTRACT

The present invention relates to a method for manufacturing a flat-plate battery. The method includes step S 1 : providing a chlorophyll layer; step S 2 : providing a first separator and a second separator absorbing a solution of organic salt respectively; step S 3 : providing a negative-electrode layer; step S 4 : coating the first separator on the negative-electrode layer; step S 5 : coating the chlorophyll layer thereon; step S 6 : coating the second separator thereon; step S 7 : coating a positive-electrode layer thereon; and step S 8 : sandwiching them between an upper plate and a lower plate. The flat-plate battery manufactured by the method can store hydrogen by the chlorophyll of the chlorophyll layer, and this method will not cause environmental pollution even when the flat-plate battery is discarded after use.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims priority of Chinese Patent Application No. 201010585584.5, filed on Dec. 13, 2010, entitled “Method For Manufacturing A Flat-Plate Battery” by Chungpin Liao, the disclosure of which is incorporated herein by reference in its entirety.

FIELD OF THE INVENTION

The present invention relates to a method for manufacturing a flat-plate battery, and more particularly to a flat-plate battery using chlorophyll to generate electricity and a method for manufacturing of the flat-plate battery.

BACKGROUND OF THE INVENTION

In recent years, portable electronic devices, such as mobile phones, portable cameras, notebook computers, digital cameras, personal digital assistants (PDAs), CD players, are becoming popular owing to their lightweight and small size. Batteries used as a portable power source have also become the focus of public concern, and have been an essential element of the various portable electronic devices.

Although some of common batteries, such as carbon-zinc batteries, alkaline batteries and secondary batteries, are allegedly environment-benign, they in fact largely contain substantial amounts of mercury and other heavy metals, such as cobalt. In addition, environmental pollutants are constantly used or released during the manufacturing processes of the batteries.

Lithium batteries, though widely adopted as the largest energy content among the portable batteries, are unstable in the electrochemical reactions. In the worst scenario, explosions may occur due to its thermal runaway as the result of operating at low load or under improper assemblage. Therefore, multiple and complex protection mechanisms should be implemented for their usage, such as the installation of a protection circuit, an exhaust vent, and isolation membranes, etc.

The price of the lithium batteries rises rapidly as a result of the depletion of lithium mineral, which is the main raw material of the positive electrode (such as Li_(1-x)CoO₂) and the negative electrode (such as Li_(x)C) of lithium batteries. Furthermore, the performance and operating life of the lithium batteries decrease rapidly within a high temperature environment.

Therefore, an unaddressed need for a flat-plate battery using chlorophyll to generate electricity exists in the art to address the aforementioned deficiencies and inadequacies.

SUMMARY OF THE INVENTION

The present invention relates to a method for manufacturing a flat-plate battery that uses chlorophyll to generate electricity that avoids the problems encountered during the manufacturing process of conventional batteries. The advantages of the present invention will be understood more readily after a consideration of the drawings and the detailed description of the preferred embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description given herein below for illustration only, and thus are not limitative of the present invention, and wherein:

FIG. 1 is a sectional view of a flat-plate battery according to an exemplary embodiment of the present invention;

FIG. 2 is a flow chart of a method for manufacturing a flat-plate battery according to an exemplary embodiment of the present invention;

FIG. 3 is a detailed flow chart of step S3 as shown in FIG. 2; and

FIG. 4 is a detailed flow chart of step S7 as shown in FIG. 2.

DETAILED DESCRIPTION OF THE INVENTION

Reference will now be made to the drawings to describe an exemplary embodiment in detail.

FIG. 1 is a schematic view of a flat-plate battery 100 according to one embodiment of the present invention. In FIG. 1, the flat-plate battery 100 of the exemplary embodiment has a negative-electrode layer 110, a first separator 120, a chlorophyll layer 130, a second separator 140, a positive-electrode layer 150, an upper plate 160 and a lower plate 170. The first separator 120 is coated on the negative-electrode layer 110, the chlorophyll layer 130 is coated on the first separator 120, the second separator 140 is coated on the chlorophyll layer 130, and the positive-electrode layer 150 is coated on the second separator 140. That is, the negative-electrode layer 110, the first separator 120, the chlorophyll layer 130, the second separator 140 and the positive-electrode layer 150 are stacked together in sequence, and they are sandwiched between the upper plate 160 and the lower plate 170 to form the flat-plate battery 100.

The negative-electrode layer 110 has a conductive layer 111 and a metal-powder layer 112, and the metal-powder layer 112 is formed on the conductive layer 111. The conductive layer 111 is made of a conductive material. The conductive material can be metal, metallic compound, or conductive polymeric material. The metal is selected from the group consisting of aluminum and gold. The metallic compound is selected from the group consisting of manganese protoxide, zinc oxide and magnesium oxide. The conductive polymeric material can be heterocycle or aromatic heterocyclic compound. Preferably, the conductive polymeric material is selected from the group consisting of polyacetylene, poly (arylene vinylene), polythiophene, polyaniline, polypyrrole and the derivatives thereof. In addition, the conductive layer 111 may have a rough surface (not marked) formed by a polishing process. Preferably, the conductive layer 111 is made of aluminum in one embodiment.

The metal-powder layer 112 comprises metal powder. The metal powder is uniformly sprayed on the conductive layer 111 to form an individual material layer. The metal powder is configured for enhancing the electric conductivity of the negative-electrode layer 110. The metal powder is one or more elements selected from the group consisting of magnesium, calcium, zinc, boron, aluminum, manganese, and iron. The weight of the metal powder is within a range of about 0.5 g to about 12 g. Preferably, the weight of the metal powder is 4 g in one embodiment.

Furthermore, it should be understood for a person skilled in the art that, the negative-electrode layer can only have the conductive layer 111 without the metal-powder layer 112 for enhancing the electric conductivity of the negative-electrode layer 110.

The first separator 120 and the second separator 140 are both made of fiber material. The fiber material can be paper material, such as cellophane, cotton paper, rice paper or silk paper, etc. Furthermore, the fiber material has pores existing therein, and the diametric length of each pores is preferably about 0.01 μm to about 1 cm. Furthermore, the first separator 120 and the second separator 140 absorb a solution of inorganic salt respectively, and the electric conductivity of the solution of inorganic salt is about 10 ms/cm to about 500 ms/cm. The inorganic salt can be organic inorganic salt without lithium, and it is selected from the group consisting of sodium iodide, sodium chloride and sodium hydroxide.

The chlorophyll layer 130 is substantially made of chlorophyll, and the chlorophyll is selected from the group consisting of chlorophyll a, chlorophyll b, chlorophyll c1, chlorophyll c2, chlorophyll d, and chlorophyll e. Typically, the chlorophyll, from which the chlorophyll oxidase may have been removed, is in powder form or in liquid form.

In addition, the chlorophyll layer 130 can also be made by mixing the chlorophyll and a polymer solution. For example, the chlorophyll in powder form and the polymer solution are blended according to a predetermined ratio, then the chlorophyll is coated to form a layer, and finally the chlorophyll is baked to form the chlorophyll layer 130.

The electric conductivity of the polymer solution is within a range of about 50 ms/cm to about 250 ms/cm. The polymer solution includes elements selected from the group consisting of boron, magnesium, aluminum, calcium, manganese and zinc. The polymer solution is further configured for adjusting the work function of the chlorophyll layer 130, so as to achieve the desired potential difference, such as 1.5 V, between the positive-electrode layer and the negative-electrode layer of the flat-plate battery 100.

In one embodiment, the polymer solution is prepared from a compound of metal ions and acid ions, polymer and solvent in a predetermined proportion. The high polymer can be the polymer of glucose. The polymer of glucose can be plant starch, such as potato starch, water chestnut starch, corn starch, sweet potato starch, lotus root starch, mustard powder, and pueraria powder, etc. The compound of metal ions and acid ions can be calcium carbonate. The solvent can have a polarity and a pH value greater than 3, such as water, seawater, tea, coffee, fruit juice or liquor, etc. The pH value of the polymer solution is about 5.5 to 8. The polymer solution can further contain vitamin, such as vitamin D.

The positive-electrode layer 150 has an activated conductive polymeric layer 151 and a conductive polymeric layer 152. The activated conductive polymeric layer 151 is made of carbon fiber cloth, carbon powder or nano conductive polymeric powder. The carbon fiber cloth or the carbon powder is selected from the group consisting of hard charcoal (or called chaoite), soot carbon, carbon black, glassy carbon, carbon nanotube, activated carbon, diamond, amorphous carbon, Graphene, fullerene, graphite, carbyne, diatomic carbon, tricarbon, atomic carbon, graphitization carbon, Pyrolytic carbon, coke, or other allotropes of carbon. The material of the conductive polymeric powder is heterocycle or aromatic heterocyclic compound. Preferably, the material of the conductive polymeric powder is selected from the group consisting of polyacetylene, poly (arylene vinylene), polythiophene, polyaniline, polypyrrole and the derivatives thereof.

In addition, the activated conductive polymeric layer 151 further contains the chlorophyll in powder form, to enhance the electric-supplying capability of the flat-plate battery 100.

The upper plate 160 and the lower plate 170 are selected from the group consisting of acrylic plates, composite plates, metal plates (such as ferrum, tin, cooper, etc.), electric glass plates, metal-oxidation plates, and alloy plates.

In the exemplary embodiment, when the flat-plate battery 100 operates, the chlorophyll of the chlorophyll layer 130 and/or the chlorophyll of the positive-electrode layer generate electrons or holes as they receive light or touch the electrolyte solution, such that a potential difference occurs between the positive-electrode layer 150 and the negative-electrode layer 110 of the flat-plate battery 100 to supply a continuous current. In other words, the flat-plate battery 100 of the present invention may use the chlorophyll of the chlorophyll layer 130 and/or the chlorophyll of the positive-electrode structure 150 as the energy source to supply the electrical energy.

FIG. 2 is a flow chart of a method for manufacturing the flat-plate battery 100 according to one embodiment of the present invention. In FIG. 2, the manufacturing method includes following steps:

-   -   Step S1: providing a chlorophyll layer 130;     -   Step S2: providing a first separator 120 and a second separator         140 absorbing a solution of inorganic salt respectively;     -   Step S3: providing a negative-electrode layer 110;     -   Step S4: coating the first separator 120 absorbed the solution         of inorganic salt on the negative-electrode layer 110;     -   Step S5: coating the chlorophyll layer 130 thereon;     -   Step S6: coating the second separator 140 absorbed the solution         of inorganic salt thereon;     -   Step S7: coating a positive-electrode layer 150 thereon; and     -   Step S8: sandwiching the chlorophyll layer 130, the first         separator 120, the second separator 140, the negative-electrode         layer 110 and the positive-electrode layer 150 between the upper         plate 160 and the lower plate 170.

In addition, as shown in FIG. 2, the manufacturing method further includes the step S4 a of pressing the first separator 120 and the negative-electrode layer 110 by a weight of 60˜70 kg, between the step S4 and the step S5.

FIG. 3 is a detailed flow chart of the step S3 as shown in FIG. 2. In FIG. 3, the step S3 further includes following steps:

-   -   Step S31: providing a conductive layer 111 and generating a         rough surface by polishing the conductive layer 111; and     -   Step S32: spraying metal powder on the rough surface of the         conductive layer 111 to form a metal-powder layer.

FIG. 4 is a detailed flow chart of the step S7 as shown in FIG. 2. In FIG. 4, the step S7 further includes following steps:

-   -   step S71: coating an activated conductive polymeric layer; and     -   step S72: further coating a conductive polymeric layer on the         activated conductive polymeric layer.

The flat-plate battery of the present invention can store hydrogen by chlorophyll of the chlorophyll layer and/or chlorophyll of the positive-electrode layer to generate electricity. Namely, during the oxidation-reduction chemical reaction, chlorophyll molecule loses a magnesium ion in its porphyrin center to become the pheophytin molecule. Two empty bonding sites of the latter then trap two hydrogen ions to practically store hydrogen and make the running of current smooth. Furthermore, the manufacturing process of the flat-plate battery is simple and economical, and only natural and non-toxic substances are used, unlike the conventional batteries, the flat-plate battery of the present invention will not cause environmental pollution even when discarding after being used.

It should be noted that the terms “first”, “second”, “third” and other terms in the present invention are only used as textual symbols as the circumstances may require, and thus the practice is not limited to these terms. It should be further noted that these terms can be used interchangeably.

While there has been shown several and alternate embodiments of the present invention, it is to be understood that certain changes can be made as would be known to one skilled in the art without departing from the underlying scope of the present invention as is discussed and set forth above and below including claims. Furthermore, the embodiments described above and claims set forth below are only intended to illustrate the principles of the present invention and are not intended to limit the scope of the present invention to the disclosed elements. 

What is claimed is:
 1. A method for manufacturing a flat-plate battery, comprising: step S1: providing a chlorophyll layer; step S2: providing a first separator and a second separator absorbing a solution of inorganic salt; step S3: providing a negative-electrode layer; step S4: arranging the first separator absorbing the solution of inorganic salt on the negative-electrode layer; step S5: arranging the chlorophyll layer on the first separator; step S6: arranging the second separator absorbing the solution of inorganic salt on the chlorophyll layer; step S7: arranging a positive-electrode layer on the second separator; and step S8: sandwiching the chlorophyll layer, the first separator, the second separator, the negative-electrode layer and the positive-electrode layer between an upper plate and a lower plate.
 2. The method of claim 1, further comprising the step S4 a between the step S4 and the step S5, pressing the first separator and the negative-electrode layer formed by the step S4 by a weight of 60˜70 kg.
 3. The method of claim 1, wherein the step S3 further comprises following steps: step S31: providing a conductive layer; and step S32: spraying metal powder on the conductive layer to form a metal-powder layer on the conductive layer.
 4. The method of claim 3, wherein the conductive layer is made of conductive material, and the conductive material is selected from the group consisting of metal, metallic compound and conductive polymeric material.
 5. The method of claim 4, wherein the metal is selected from the group consisting of aluminum and gold, the metallic compound is selected from the group consisting of manganese protoxide, zinc oxide and magnesium oxide, and the conductive polymeric material is heterocycle or aromatic heterocyclic compound and selected from the group consisting of polyacetylene, poly (arylene vinylene), polythiophene, polyaniline, polypyrrole and their derivatives.
 6. The method of claim 3, wherein the metal powder is selected from the group consisting of magnesium, calcium, zinc, boron, aluminum, manganese, iron, and combinations thereof.
 7. The method of claim 1, wherein the first separator and the second separator are both made of fiber material, and the fiber material is paper material selected from the group consisting of cellophane, cotton paper, rice paper and silk paper.
 8. The method of claim 1, wherein the inorganic salt is inorganic salt without lithium, and the inorganic salt is selected from the group consisting of sodium iodide, sodium chloride and sodium hydroxide.
 9. The method of claim 1, wherein the chlorophyll layer comprises chlorophyll.
 10. The method of claim 9, wherein the chlorophyll is selected from the group consisting of chlorophyll a, chlorophyll b. chlorophyll c1, chlorophyll c2, chlorophyll d, and chlorophyll.
 11. The method of claim 9, wherein the chlorophyll is in powder form or in liquid form.
 12. The method of claim 9, wherein a chlorophyll oxidase has been removed from the chlorophyll.
 13. The method of claim 9, wherein the chlorophyll layer further comprises a polymer solution.
 14. The method of claim 13, wherein the polymer solution comprises compound of metal ions and acid ions, polymer and solvent.
 15. The method of claim 14, wherein the polymer is polymer of glucose, and the polymer of glucose is selected from the group consisting of potato starch, water chestnut starch, corn starch, sweet potato starch, lotus root starch, mustard powder and pueraria powder.
 16. The method of claim 14, wherein the compound of metal ions and acid ions is calcium carbonate.
 17. The method of claim 1, wherein the step S7 comprises following steps: step S71: arranging an activated conductive polymeric layer; and step S72: further arranging a conductive polymeric layer on the activated conductive polymeric layer.
 18. The method of claim 17, wherein the activated conductive polymeric layer is made of carbon fiber cloth, carbon powder or nano conductive polymeric powder.
 19. The method of claim 18, wherein the activated conductive polymeric layer further comprises the chlorophyll in powder form.
 20. The method of claim 1, wherein the upper plate and the lower plate are selected from the group consisting of acrylic plates, composite plates, metal plates, electric glass plates, metal-oxidation plates and alloy plates. 